A1

Etymology

 * Specified in.

Etymology 1
From various rating systems, as that of Lloyd's of London or the condition of insured ships. First attested in 1837.

Adjective

 * 1)  In good health.
 * 2)  In excellent or top condition.
 * 3)  First-class.

Noun

 * 1) Under the  (French: Union internationale des chemins de fer, UIC) classification system, a steam locomotive that has two coupled driving wheels followed by two trailing wheels, with no leading wheels; also called an 0-2-2.

Noun

 * 1)  front page of a newspaper

Etymology
See the Wikipedia article ISO 216, the international standard on paper sizes.

Noun

 * 1) A1 a standard paper size, defined by ISO 216